Rewriting client socket privilige part and adding exec path service

Rewriting client socket privilige part and adding exec path service

[Issue#] SSDWSSP-367
[Bug/Feature] N/A
[Cause] Rewriting client API and security-server socket privilige checks
functionality to match recently written security-server services
[Solution] Rewriting client API to use new implementation of sockets,
adding new service for get execution path request
[Verification] Successful build.
        Run test 'security-server-test-client-smack'
        with 'regexp=sock' argument and check dlog logs whether
        execution path is being properly send
        (This functionality is not in ss API, so no tests for
        this specific service are available)

Change-Id: I49031860de14986f73899cb8c99f061241ede39b